An A-ha moment ... for some

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Pitbull and Christina Aguilera were joined onstage by Morten Harket (pictured) of 80s group A-Ha, whose rendition of "Take On Me" had stars like Selena Gomez bopping their heads. But Jenny McCarthy was the only one in the audience old enough to know the lyrics. -- Molly Chance, Zap2it

Pitbull and Christina Aguilera were joined onstage by Morten Harket (pictured) of 80s group A-Ha, whose rendition of "Take On Me" had stars like Selena Gomez bopping their heads. But Jenny McCarthy was the only one in the audience old enough to know the lyrics. -- Molly Chance, Zap2it (Getty Images)

Pitbull and Christina Aguilera were joined onstage by Morten Harket (pictured) of 80s group A-Ha, whose rendition of "Take On Me" had stars like Selena Gomez bopping their heads. But Jenny McCarthy was the only one in the audience old enough to know the lyrics. -- Molly Chance, Zap2it